I thought I was gonna have a hard time accepting the N-1 starfighter but in my mind, I can accept that maybe Peli simply used her junker/spaceport contacts to source it from somewhere quite possibly beyond Tatooine. I mean, she does run a docking bay and knows her way around fixing ships so it at least seems plausible she probably has some far reaching contacts.
It seems Mando had commissioned her to find him a ship and so maybe she cast a wide net and that’s what she came up with, a rare and unusual ship that somehow left Royal Naboo auspices…but also a total, decomissioned basketcase.
I don’t see these being contracted out or being used beyond the Naboo royalty and even upon decommissioning, probably done so by the Naboo themselves. However, maybe somehow one fell through the cracks or was otherwise obtained through unique circumstances.